\begin{tikzpicture}
    \tkzDefPoints{0/0/B,  2.4/0/C,  1.2/3/A}
    \tkzDefPointOnLine[pos=1.4](B,A)  \tkzGetPoint{E}
    \tkzDefLine[bisector](C,A,E)  \tkzGetPoint{D}

    \tkzDrawPolygon(A,B,C)
    \tkzDrawSegments(A,D  A,E)
    \extkzLabelAngel[0.3](D,A,E){$1$}
    \extkzLabelAngel[0.4](C,A,D){$2$}
    \tkzMarkSegments(A,B  A,C)
    \tkzLabelPoints[left](A,E)
    \tkzLabelPoints[below](B,C)
    \tkzLabelPoints[right](D)
\end{tikzpicture}

